Firewall and Anti-virus for Windows 2003 Servers

[Flashster]

Background:
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I am setting up (or will be soon) a colo w2k3 server mainly for hosting web sites I design for my clients (small businesses). The clients will only have 'write' access to the server by way of the content managment system I integrate with their web site.

I will only have 1-2u of space (i.e. 1 server which I've yet to build), 1 power socket, and a small number of IP addresses. I am familiar with w2k server, but have yet to get my hands on w2k3, hence some of my questions below.

I think it would be useful to be able to a limited number of pop mail accounts with my web offering - say 10-15 pop addresses per domain.

My backup questions are:
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1) What sofware firewall do you recommend?
Routing and Remote Access, and Visnetic have been suggested so far.

2) What Anti-Virus would you recommend - I would assume this is need if I am to run a mail service and possibly allow clients to upload docs to the server via the content management system?

Thanks in advance.

Flash